Introduce independent hstride and vstride, and use them.

Bug: 27589011
Bug: IMINAN-49451

Change-Id: I4d7069baef5d01e6009b0e72a6913f1de370b9e9
Signed-off-by: Alistair Strachan <alistair.strachan@imgtec.com>
Signed-off-by: Austin Hu <austin.hu@intel.com>
2 files changed